Add {c,cxx}.class variables

Compiler class describes a set of compilers that follow more or less
the same command line interface. Compilers that don't belong to any of
the existing classes are in classes of their own (say, Sun CC would be
on its own if we were to support it).

Currently defined compiler classes:

gcc          gcc, clang, clang-apple, icc (on non-Windows)
msvc         msvc, clang-cl, icc (Windows)

1 files changed, 15 insertions, 8 deletions

diff --git a/build2/cc/module.cxx b/build2/cc/module.cxx
index badd0ef..92a04a7 100644
--- a/build2/cc/module.cxx
+++ b/build2/cc/module.cxx
@@ -122,6 +122,8 @@ namespace build2
       rs.assign (x_id_type) = ci.id.type;
       rs.assign (x_id_variant) = ci.id.variant;
 
+      rs.assign (x_class) = to_string (ci.class_);
+
       rs.assign (x_version) = ci.version.string;
       rs.assign (x_version_major) = ci.version.major;
       rs.assign (x_version_minor) = ci.version.minor;
@@ -159,15 +161,20 @@ namespace build2
       dir_paths lib_dirs;
       dir_paths inc_dirs;
 
-      if (ci.id.value () == compiler_id::msvc)
-      {
-        lib_dirs = msvc_library_search_paths (ci.path, rs);
-        inc_dirs = msvc_header_search_paths (ci.path, rs);
-      }
-      else
+      switch (ci.class_)
       {
-        lib_dirs = gcc_library_search_paths (ci.path, rs);
-        inc_dirs = gcc_header_search_paths (ci.path, rs);
+      case compiler_class::gcc:
+        {
+          lib_dirs = gcc_library_search_paths (ci.path, rs);
+          inc_dirs = gcc_header_search_paths (ci.path, rs);
+          break;
+        }
+      case compiler_class::msvc:
+        {
+          lib_dirs = msvc_library_search_paths (ci.path, rs);
+          inc_dirs = msvc_header_search_paths (ci.path, rs);
+          break;
+        }
       }
 
       sys_lib_dirs_extra = lib_dirs.size ();